XF 2.1 Sending mail in large numbers

Hello, I would like to know how I could send in this part

203340

an email to some members because I have each time an error if below.

203341

How can I select who should receive an email.


Thanks for your help
 
the concern is, for example, 5 members we forget to present and I would like to select them for sending them an email to remind them to introduce themselves. I can put their email address or nickname but if I put a second pass it does not even if I put between that point or comma or semicolon.
 
Is there a way to send to multiple usernames under User Criteria? I tried separating with a comma and a space, but it seems the only way is to send to one username at a time, otherwise it says 'No users matched the specified criteria.'

I searched for a solution but this thread was the only one I saw that touched on the subject.. so bump.
 
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